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| author | drh <> | 2023-06-09 15:54:18 +0000 |
|---|---|---|
| committer | drh <> | 2023-06-09 15:54:18 +0000 |
| commit | 7520116441617c4e34cf8d81a6013c760e00b542 (patch) | |
| tree | 92d00d0988d240ce555efd062e2bf520e111abdb /src | |
| parent | 6e4ff8707e884e2dc7430737b3d75a7c131c313c (diff) | |
| download | sqlite-7520116441617c4e34cf8d81a6013c760e00b542.tar.gz sqlite-7520116441617c4e34cf8d81a6013c760e00b542.zip | |
Simplify a memcpy() in defragmentPage(). It now might copy more content than
is strictly necessary, but runs faster and uses less code space. Possible
reasons for the improved performance:
(1) the copy is now always 8-byte aligned,
(2) fewer intermediate results are required which means less register
pressure which helps the compiler to optimize the subroutine.
FossilOrigin-Name: 6e5607ae4d872954483a8d7a5c866aa41e4af70fae9652fb7eb211b316ab724d
Diffstat (limited to 'src')
| -rw-r--r-- | src/btree.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/btree.c b/src/btree.c index 9d6bdf2e5..5626bf53d 100644 --- a/src/btree.c +++ b/src/btree.c @@ -1635,7 +1635,7 @@ static int defragmentPage(MemPage *pPage, int nMaxFrag){ iCellStart = get2byte(&data[hdr+5]); if( nCell>0 ){ temp = sqlite3PagerTempSpace(pPage->pBt->pPager); - memcpy(&temp[iCellStart], &data[iCellStart], usableSize - iCellStart); + memcpy(temp, data, usableSize); src = temp; for(i=0; i<nCell; i++){ u8 *pAddr; /* The i-th cell pointer */ |